Experimental study on the behavior characteristics of 1,4-dioxane in soil environment

Abstract

In Japan, the Environmental Quality Standards for Soil Pollution of 1,4-dioxene was enforced in April 2017. In this study, the properties of 1,4-dioxane between three phases in soil were confirmed by batch tests and the volatility, infiltration and adsorption characteristics of 1,4-dioxane in soil, and groundwater were confirmed by three types soil column tests. The following conclusions were drawn from the results of these tests: The amount of 1,4-dioxane volatilized from unsaturated soil is relatively small, and most of volatilized 1,4-dioxane dissolves in soil pore water while it migrate and diffuses through the soil pore space. 1,4-dioxane quickly infiltrate downwards in unsaturated soil during rain infiltration, but shows no migration in unsaturated soil unless the rain infiltration occurs. There is a possibility that soil contamination occurs downgradient of groundwater flow when 1,4-dioxane contaminated groundwater continues to flow.